Here's three. One is caulking tubes. The more leftovers in them the better! Especially good are the aluminum tubes for polyurethane sealant used by most all windshield installers. I'm getting 7-800 feet outta these babies. Haven't measured the max flights, as they are too far into the puckerbrush!

My newest favorite is a round macde from solid steel with 1.78" tubing used for a skirt for catchng air and another piece as a stabilizer on the tail. Weight is roughly four pounds. Longest haul so far at a high angle shot is .17 of a mile, whatever that is. If shot nearly straight up, it'll pile drive 6" into the frozen ground. There's a link to a pic and vid of the round below. Hmmmm..... I think I'll call it my antitank round!

The engry of this stuff is what amazes me most. I did a near vertical shot with it today and when it hit the ground, at a straight up angle, the weight of the shaft and muffler pipe tail bent the shaft 1" from the end, down inside the air skirt. That's 5/8" SOLID round stock!

thats a nice damage shot, im going to be recording a video soon (if the weather permits) showing how a pair of crappy printers make great targets for 2" plastic slugs

since its not really tail stabilized its gonna tumble, i bet you if you hit a full sheet of 5/8" plywood with that crazy ass tank round at the right time it tumbled (ex sideways) it would blast a hole right through it with great splintering effects

Nah, the "tank round" doesn't tumble. It yaws a little upon exit then flies extremely straight..... I guess I could say "flew", as it is currently awol down in the woods.

The caulking tubes made from aluminum don't tumble either. Especially whe 1.5" of mortar is dumped in the tips of them! I've added 7 feet to the barrel, giving more acceleration time, and got .25 of a mile from one of those puppies a few weekends ago. I wish I had a way to vid them to show the speed and trueness of the way those things fly. Truly impressive!